CELL-LEVEL STATISTICS COLLECTION FOR DETECTION AND DECODING IN FLASH MEMORIES

摘要

Methods and apparatus are provided for collecting cell-level statistics for detection and decoding in flash memories. Data from a flash memory device is processed by obtaining one or more read values for a plurality of bits in a page of the flash memory device; and generating cell-level statistics for the flash memory device based on a probability that a data pattern was read from the plurality of bits given that a particular pattern was written to the plurality of bits. The cell-level statistics are optionally generated substantially simultaneously with a reading of the read values, for example, as part of a read scrub process. The cell-level statistics can be used to convert the read values for the plurality of bits to a reliability value for a bit among the plurality of bits.